Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2024-12-27 01:24:38 +00:00
Code Issues Projects Releases Packages Wiki Activity

added support for shadow syscall table

Browse source 
svn path=/trunk/; revision=997
This commit is contained in:
Rex Jolliff 2000-02-22 07:27:30 +00:00
parent 7cb2e823a0
commit 5db4e55264
1 changed files with 72 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

81
reactos/ntoskrnl/ke/i386/usercall.c
View file

@ -1,4 +1,4 @@
/* $Id: usercall.c,v 1.6 2000/02/21 22:41:05 ekohl Exp $
/* $Id: usercall.c,v 1.7 2000/02/22 07:27:30 rex Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -178,13 +178,70 @@ void interrupt_handler2e(void);
/* Users's current stack frame pointer is source */
"movl %edx,%esi\n\t"
/* FIXME: determine system service table to use */
/* FIXME: check to see if SS is valid/inrange */
/* Determine system service table to use */
"cmpl $0x0fff, %eax\n\t"
"ja useShadowTable\n\t"
/* Check to see if SS is valid/inrange */
"cmpl _KeServiceDescriptorTable + 8, %eax\n\t"
"jbe serviceInRange\n\t"
"movl $"STR(STATUS_INVALID_SYSTEM_SERVICE)", %eax\n\t"
"jmp done\n\t"
"serviceInRange:\n\t"
/* Allocate room for argument list from kernel stack */
"movl %es:_MainSSPT(,%eax,4), %ecx\n\t"
//"movl %es:__SystemServiceTable(,%eax,8),%ecx\n\t"
"subl %ecx,%esp\n\t"
"movl %es:_KeServiceDescriptorTable + 12, %ecx\n\t"
"movl %es:(%ecx, %eax, 4), %ecx\n\t"
"subl %ecx, %esp\n\t"
/* Copy the arguments from the user stack to the kernel stack */
"movl %esp,%edi\n\t"
"rep\n\tmovsb\n\t"
/* DS is now also kernel segment */
"movw %bx, %ds\n\t"
/* Call system call hook */
"pushl %eax\n\t"
"call _KiSystemCallHook\n\t"
"popl %eax\n\t"
/* Make the system service call */
"movl %es:_KeServiceDescriptorTable, %ecx\n\t"
"movl %es:(%ecx, %eax, 4), %eax\n\t"
"call *%eax\n\t"
#if CHECKED
/* Bump Service Counter */
#endif
/* Deallocate the kernel stack frame */
"movl %ebp,%esp\n\t"
/* Call the post system call hook and deliver any pending APCs */
"pushl %eax\n\t"
"call _KiAfterSystemCallHook\n\t"
"addl $8,%esp\n\t"
"jmp done\n\t"
"useShadowTable:\n\t"
"subl $0x1000, %eax\n\t"
/* Check to see if SS is valid/inrange */
"cmpl _KeServiceDescriptorTableShadow + 8, %eax\n\t"
"jbe shadowServiceInRange\n\t"
"movl $"STR(STATUS_INVALID_SYSTEM_SERVICE)", %eax\n\t"
"jmp done\n\t"
"shadowServiceInRange:\n\t"
/* Allocate room for argument list from kernel stack */
"movl %es:_KeServiceDescriptorTableShadow + 12, %ecx\n\t"
"movl %es:(%ecx, %eax, 4), %ecx\n\t"
"subl %ecx, %esp\n\t"
/* Copy the arguments from the user stack to the kernel stack */
"movl %esp,%edi\n\t"
@ -199,9 +256,13 @@ void interrupt_handler2e(void);
"popl %eax\n\t"
/* Make the system service call */
//"movl %ds:__SystemServiceTable+4(,%eax,8),%eax\n\t"
"movl %ds:_MainSSDT(,%eax,4),%eax\n\t"
"call *%eax\n\t"
"movl %es:_KeServiceDescriptorTableShadow, %ecx\n\t"
"movl %es:(%ecx, %eax, 4), %eax\n\t"
"call *%eax\n\t"
#if CHECKED
/* Bump Service Counter */
#endif
/* Deallocate the kernel stack frame */
"movl %ebp,%esp\n\t"
@ -211,6 +272,8 @@ void interrupt_handler2e(void);
"call _KiAfterSystemCallHook\n\t"
"addl $8,%esp\n\t"
"done:\n\t"
/* Restore the user context */
"addl $4,%esp\n\t" /* UserContext */
"addl $24,%esp\n\t" /* Dr[0-3,6-7] */